Method and apparatus for controlling an electrically driven automotive air conditioner
First Claim
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1. A method of controlling an electrically driven automotive air conditioning system, comprising the steps of:
- monitoring driver commanded air conditioner air delivery temperature, driver commanded proportion of outside to recirculated air to be introduced to the air conditioning system and driver commanded air conditioner blower fan speed;
measuring actual air delivery temperature, motor power and motor temperature;
varying the motor speed of the motor driving the air conditioner compressor to minimize difference between commanded and measured air delivery temperature;
positioning a damper to achieve commanded proportion of outside to recirculated air;
setting blower fan speed to commanded speed;
overriding damper position and reducing the proportion of outside air, when motor power or temperature exceed predetermined limits, so that motor load is reduced;
reducing motor speed when motor power or temperature exceed predetermined limits so that motor load is reduced;
overriding commanded blower fan speed and reducing fan speed to reduce the load on the motor, when allowable motor temperature or power are exceeded; and
restoring overridden damper position and fan speed, and allowing motor speed to vary to achieve commanded air temperature, when motor power and temperature no longer exceed allowable limits.
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Abstract
A control system for an electrically driven variable capacity automotive air conditioning system affords the passenger maximum comfort control without overloading an electrically commutated motor compressor drive. Driver selected comfort settings are sequentially overridden to avoid overloading the motor. As motor overload conditions are alleviated the control system gradually returns to the initial driver selected comfort settings.
199 Citations
9 Claims
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1. A method of controlling an electrically driven automotive air conditioning system, comprising the steps of:
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monitoring driver commanded air conditioner air delivery temperature, driver commanded proportion of outside to recirculated air to be introduced to the air conditioning system and driver commanded air conditioner blower fan speed; measuring actual air delivery temperature, motor power and motor temperature; varying the motor speed of the motor driving the air conditioner compressor to minimize difference between commanded and measured air delivery temperature; positioning a damper to achieve commanded proportion of outside to recirculated air; setting blower fan speed to commanded speed; overriding damper position and reducing the proportion of outside air, when motor power or temperature exceed predetermined limits, so that motor load is reduced; reducing motor speed when motor power or temperature exceed predetermined limits so that motor load is reduced; overriding commanded blower fan speed and reducing fan speed to reduce the load on the motor, when allowable motor temperature or power are exceeded; and restoring overridden damper position and fan speed, and allowing motor speed to vary to achieve commanded air temperature, when motor power and temperature no longer exceed allowable limits. - View Dependent Claims (2, 3)
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4. A method of controlling an electrically driven automotive air conditioning system, comprising the steps of:
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monitoring driver commanded cabin temperature and driver commanded proportion of outside air to recirculated air; measuring cabin air temperature, motor power and motor temperature; varying motor speed to minimize difference between commanded and measured temperature; positioning a damper to achieve commanded proportion of outside to recirculated air; determining blower fan speed responsive to the present value of motor speed, with blower fan speed increasing with increasing motor speed; setting blower fan speed to the determined value; overriding damper position and reducing the proportion of outside air, when motor power or temperature exceed predetermined limits, so that motor load is reduced; reducing motor speed when motor power or temperature exceed predetermined limits, so that motor load is reduced; and restoring overridden damper position and allowing motor speed to vary to achieve commanded cabin temperature when motor power and motor temperature no longer exceed allowable limits. - View Dependent Claims (5, 6)
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7. Electrically driven automotive air conditioner system comprising:
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a damper for controlling the proportion of outside air to recirculated air introduced to the air conditioning system; a blower fan for controlling the rate at which air conditioned air is delivered; a compressor; a brushless DC motor hermetically sealed with and directly coupled to said compressor; means for monitoring driver commanded air conditioner air delivery temperature, driver commanded proportion of outside to recirculated air introduced into the air conditioning system and driver commanded air conditioner blower fan speed; means for measuring actual air delivery temperature, motor power and motor temperature; means for varying brushless DC motor speed to minimize the difference between commanded and measured air delivery temperature; means for positioning a damper to achieve commanded proportion of outside to recirculated air; means for setting blower fan speed to commanded speed; means for overriding damper position and reducing the proportion of outside air when motor power or temperature exceed predetermined limits, so that motor load is reduced; means for reducing motor speed when motor power or temperature exceed predetermined limits, so that motor load is reduced; means for overriding commanded blower fan speed to reduce fan speed to reduce the load on the motor when allowable motor temperature or power are exceeded; and means for restoring overridden damper position and fan speed and allowing motor speed to vary to achieve commanded air temperature when motor power and temperature no longer exceed predetermined limits.
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8. Electrically driven automotive air conditioner system comprising:
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a damper for controlling the proportion of outside air to recirculated air introduced to the air conditioning system; a blower fan for controlling the rate at which air conditioned air is delivered; a compressor; a brushless DC motor hermetically sealed with and directly coupled to said compressor; means for monitoring driver commanded cabin temperature and driver commanded proportion of outside air to recirculated air; means for measuring cabin air temperature, motor power and motor temperature; means for varying motor speed to minimize difference between commanded and measured temperature; means for positioning the damper to achieve commanded proportion of outside to recirculated air; means for determining blower fan speed responsive to the present value of motor speed, with blower fan speed increasing with increasing motor speed; means for setting blower fan speed to the determined value; means for overriding damper position, reducing the proportion of outside air when motor power or temperature exceed predetermined limits, so that motor load is reduced; means for reducing motor speed when motor power or temperature exceed predetermined limits, so that motor load is reduced; and means for restoring overridden damper position and allowing DC motor speed to vary to achieve commanded cabin temperature when motor power and motor temperature no longer exceed predetermined limits. - View Dependent Claims (9)
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Specification